Skip to content
master
Go to file
Code

Latest commit

 

Git stats

Files

Permalink
Failed to load latest commit information.
Type
Name
Latest commit message
Commit time
.ci
 
 
 
 
 
 
 
 
 
 
 
 
src
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

README.md

js-bigchaindb-driver

Official JavaScript driver for BigchainDB to create transactions in Node.js and the browser.

Join the chat at https://gitter.im/bigchaindb/js-bigchaindb-driver npm codecov js ascribe Build Status Greenkeeper badge

Compatibility

BigchainDB Server BigchainDB JavaScript Driver
0.10 0.1.x
1.0.0 0.3.x
1.3.x 3.x.x
>= 2.0.0 4.x.x

Breaking changes

  • Version 4.0 of BigchainDB JavaScript Driver makes the driver compatible with BigchainDB 2.0. There are new functions for sending off transactions along with other changes. Check older versions
  • Version 3.2 of BigchainDB JavaScript Driver introduces a new way of creating transfer transactions. Check older versions

Table of Contents


Installation and Usage

npm install bigchaindb-driver
const driver = require('bigchaindb-driver')
// or ES6+
import driver from 'bigchaindb-driver'

Example: Create a transaction

const driver = require('bigchaindb-driver')
const base58 = require('bs58');
const { Ed25519Sha256 } = require('crypto-conditions');

// BigchainDB server instance (e.g. https://example.com/api/v1/)
const API_PATH = 'http://localhost:9984/api/v1/'

// Create a new keypair.
const alice = new driver.Ed25519Keypair()

// Construct a transaction payload
const tx = driver.Transaction.makeCreateTransaction(
    // Define the asset to store, in this example it is the current temperature
    // (in Celsius) for the city of Berlin.
    { city: 'Berlin, DE', temperature: 22, datetime: new Date().toString() },

    // Metadata contains information about the transaction itself
    // (can be `null` if not needed)
    { what: 'My first BigchainDB transaction' },

    // A transaction needs an output
    [ driver.Transaction.makeOutput(
            driver.Transaction.makeEd25519Condition(alice.publicKey))
    ],
    alice.publicKey
)

// Sign the transaction with private keys
const txSigned = driver.Transaction.signTransaction(tx, alice.privateKey)

// Or use delegateSignTransaction to provide your own signature function
function signTransaction() {
    // get privateKey from somewhere
    const privateKeyBuffer = Buffer.from(base58.decode(alice.privateKey))
    return function sign(transaction, input, transactionHash) {
        const ed25519Fulfillment = new Ed25519Sha256();
        ed25519Fulfillment.sign(
            Buffer.from(transactionHash, 'hex'),
            privateKeyBuffer
        );
        return ed25519Fulfillment.serializeUri();
    };
}
const txSigned = driver.Transaction.delegateSignTransaction(tx, signTransaction())

// Send the transaction off to BigchainDB
const conn = new driver.Connection(API_PATH)

conn.postTransactionCommit(txSigned)
    .then(retrievedTx => console.log('Transaction', retrievedTx.id, 'successfully posted.'))

Browser usage

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>BigchainDB boilerplate</title>
        <!-- Adjust version to your needs -->
        <script src="https://unpkg.com/bigchaindb-driver@4.0.0/dist/browser/bigchaindb-driver.window.min.js"></script>

        <script>
            // BigchainDB server instance (e.g. https://example.com/api/v1/)
            const API_PATH = 'http://localhost:9984/api/v1/'

            // Create a new keypair.
            const alice = new BigchainDB.Ed25519Keypair()

            // Construct a transaction payload
            const tx = BigchainDB.Transaction.makeCreateTransaction(
                // Define the asset to store, in this example it is the current temperature
                // (in Celsius) for the city of Berlin.
                { city: 'Berlin, DE', temperature: 22, datetime: new Date().toString() },

                // Metadata contains information about the transaction itself
                // (can be `null` if not needed)
                { what: 'My first BigchainDB transaction' },

                // A transaction needs an output
                [ BigchainDB.Transaction.makeOutput(
                        BigchainDB.Transaction.makeEd25519Condition(alice.publicKey))
                ],
                alice.publicKey
            )

            // Sign the transaction with private keys
            const txSigned = BigchainDB.Transaction.signTransaction(tx, alice.privateKey)

            // Send the transaction off to BigchainDB
            let conn = new BigchainDB.Connection(API_PATH)

            conn.postTransactionCommit(txSigned)
                .then(res => {
                    const elem = document.getElementById('lastTransaction')
                    elem.href = API_PATH + 'transactions/' + txSigned.id
                    elem.innerText = txSigned.id
                    console.log('Transaction', txSigned.id, 'accepted')
                })
            // Check console for the transaction's status
        </script>
    </head>
    <body id="home">
        <h1>Hello BigchainDB</h1>
        <p>Your transaction id is: <a id="lastTransaction" target="_blank"><em>processing</em></a></p>
    </body>
</html>

BigchainDB Documentation

Speed Optimizations

This implementation plays "safe" by using JS-native (or downgradable) libraries for its crypto-related functions to keep compatibilities with the browser. If you do want some more speed, feel free to explore the following:

Development

git clone git@github.com:bigchaindb/js-bigchaindb-driver.git
cd js-bigchaindb-driver/

npm i
npm run dev

After updating source files in src/, make sure to update the API documentation. The following command will scan all source files and create the Markdown output into ./API.md:

npm run doc

Release Process

See the file named RELEASE_PROCESS.md.

Authors

Licenses

See LICENSE and LICENSE-docs.